Use the premises and conclusion to answer the questions. premises: if an angle measure is less than 90°, then the angle is an acute angle. the measure of angle ∠b is 48°. conclusion: ∠b is an acute angle. is the argument valid? why or why not? the argument is not valid because the conclusion does not follow from the premises. the argument is not valid because the premises are not true. the argument is valid by the law of syllogism. the argument is valid by the law of detachment.

For a science project, a high school research team conducted a survey of local air temperatures. based on the results of the survey, the found that the average temperatures were around 10 degrees higher than expected. this result was wrong. the trouble with the survey was that most of the locations were exposed to direct sunlight and located over asphalt or sand, which resulted in higher temperatures than normal. this is a classic example of an error in which phase of inferential statistics?